071
FNCA52 TJSJ 231930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST THU JUL 23 2026
DISCUSSION
AN INTERESTING PATTERN IS FORECAST FOR TOMORROW'S FIRE DANGER
THREAT. A MUCH DRIER AIRMASS WILL DOMINATE THE REGION BY EARLY
MORNING; HOWEVER, THE ARRIVAL OF A WEAK TROPICAL WAVE WILL
QUICKLY INCREASE RELATIVE HUMIDITY (RH) ACROSS THE AREA.
MEANWHILE, SURFACE WINDS WILL REMAIN BELOW THRESHOLD VALUES,
MOSTLY RANGING BETWEEN 10-15 MPH. GIVEN THE EXPECTED CONDITIONS,
THERE WILL BE A MODERATE FIRE DANGER RISK DURING THE DAY.
PRZ014-240800-
SOUTHEAST COASTAL PLAINS-
330 PM AST THU JUL 23 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10 10
TEMP (24H TREND) 72 (-4) 91 (0) 75 90
RH % (24H TREND) 87 (-2) 53 (-11) 89 54
WIND 20FT/EARLY(MPH) E 13 E 19 E 13 E 17
WIND 20FT/LATE(MPH) E 11 E 23 NE 11 E 21
MIXING HGT(FT-AGL/MSL) 5020 5470
TRANSPORT WND (MPH) E 18 E 22
VENT RATE (KT-FT) 80320 103930
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-240800-
SOUTHERN HILLS-
330 PM AST THU JUL 23 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 30 0 30
TEMP (24H TREND) 68 (-5) 89 (+3) 71 87
RH % (24H TREND) 96 (+3) 58 (-10) 97 60
WIND 20FT/EARLY(MPH) E 11 E 16 E 12 E 14
WIND 20FT/LATE(MPH) E 11 E 17 NE 12 E 16
MIXING HGT(FT-AGL/MSL) 5860 5990
TRANSPORT WND (MPH) E 17 E 20
VENT RATE (KT-FT) 87900 101830
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-240800-
NORTH COASTAL PLAINS-
330 PM AST THU JUL 23 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 10 30
TEMP (24H TREND) 72 (-3) 90 (-1) 75 89
RH % (24H TREND) 96 (+1) 62 (-5) 98 66
WIND 20FT/EARLY(MPH) SE 13 E 17 E 18 E 17
WIND 20FT/LATE(MPH) SE 10 E 21 E 11 E 23
MIXING HGT(FT-AGL/MSL) 4630 5190
TRANSPORT WND (MPH) E 18 E 21
VENT RATE (KT-FT) 74080 93420
DISPERSION 5 5
DSI 4 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-240800-
NORTHERN HILLS-
330 PM AST THU JUL 23 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 20 40 10 40
TEMP (24H TREND) 70 (-2) 89 (0) 72 88
RH % (24H TREND) 98 (+1) 63 (-3) 99 68
WIND 20FT/EARLY(MPH) SE 12 E 14 E 14 E 14
WIND 20FT/LATE(MPH) SE 8 E 19 E 10 E 20
MIXING HGT(FT-AGL/MSL) 6020 6220
TRANSPORT WND (MPH) E 16 E 17
VENT RATE (KT-FT) 84280 93300
DISPERSION 5 5
DSI 3 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-240800-
WEST COAST-
330 PM AST THU JUL 23 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR PCLDY
PRECIP TYPE NONE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 0 60 20 40
TEMP (24H TREND) 72 (-2) 91 (-1) 74 90
RH % (24H TREND) 96 (0) 59 (-8) 98 65
WIND 20FT/EARLY(MPH) SE 14 E 13 E 13 E 13
WIND 20FT/LATE(MPH) E 13 E 17 E 12 E 14
MIXING HGT(FT-AGL/MSL) 4780 4330
TRANSPORT WND (MPH) E 10 E 10
VENT RATE (KT-FT) 43020 38970
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-240800-
EASTERN INTERIOR-
330 PM AST THU JUL 23 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 30 20 40
TEMP (24H TREND) 71 (-3) 89 (0) 72 89
RH % (24H TREND) 97 (+3) 60 (-6) 98 63
WIND 20FT/EARLY(MPH) SE 12 E 16 E 12 E 14
WIND 20FT/LATE(MPH) E 12 E 16 E 13 E 14
MIXING HGT(FT-AGL/MSL) 5560 6510
TRANSPORT WND (MPH) E 18 E 20
VENT RATE (KT-FT) 88960 110670
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-240800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST THU JUL 23 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 50 20 40
TEMP (24H TREND) 69 (-3) 84 (+2) 70 84
RH % (24H TREND) 100 (+3) 68 (-9) 100 71
WIND 20FT/EARLY(MPH) SE 10 E 14 E 10 E 13
WIND 20FT/LATE(MPH) E 9 E 14 E 10 E 13
MIXING HGT(FT-AGL/MSL) 4150 4460
TRANSPORT WND (MPH) E 20 E 21
VENT RATE (KT-FT) 70550 80280
DISPERSION 5 5
DSI 5 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-240800-
CENTRAL MOUNTAIN RANGE-
330 PM AST THU JUL 23 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 10 50 10 50
TEMP (24H TREND) 67 (-3) 87 (+3) 68 86
RH % (24H TREND) 99 (+2) 63 (-10) 100 68
WIND 20FT/EARLY(MPH) SE 9 E 10 E 9 E 10
WIND 20FT/LATE(MPH) E 8 E 12 E 9 E 12
MIXING HGT(FT-AGL/MSL) 6840 7780
TRANSPORT WND (MPH) E 15 E 14
VENT RATE (KT-FT) 88920 93360
DISPERSION 5 5
DSI 2 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-240800-
CAYEY MOUNTAIN RANGE-
330 PM AST THU JUL 23 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 30 20 30
TEMP (24H TREND) 69 (-3) 85 (+1) 71 85
RH % (24H TREND) 100 (+1) 66 (-8) 100 70
WIND 20FT/EARLY(MPH) E 10 E 13 E 10 E 13
WIND 20FT/LATE(MPH) E 9 E 13 E 10 E 13
MIXING HGT(FT-AGL/MSL) 4800 5590
TRANSPORT WND (MPH) E 20 E 22
VENT RATE (KT-FT) 81600 106210
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-240800-
VIEQUES-
330 PM AST THU JUL 23 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 50 20 40
TEMP (24H TREND) 78 (-1) 89 (-1) 79 88
RH % (24H TREND) 85 (-1) 63 (-1) 91 66
WIND 20FT/EARLY(MPH) E 14 E 18 E 17 E 18
WIND 20FT/LATE(MPH) E 14 E 17 E 18 E 17
MIXING HGT(FT-AGL/MSL) 3390 3270
TRANSPORT WND (MPH) E 18 E 23
VENT RATE (KT-FT) 54240 65400
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-240800-
CULEBRA-
330 PM AST THU JUL 23 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 50 20 30
TEMP (24H TREND) 78 (-2) 90 (+1) 78 89
RH % (24H TREND) 86 (-1) 64 (-6) 93 67
WIND 20FT/EARLY(MPH) E 16 E 18 E 17 E 18
WIND 20FT/LATE(MPH) E 14 E 17 E 18 E 17
MIXING HGT(FT-AGL/MSL) 3470 3280
TRANSPORT WND (MPH) E 18 E 23
VENT RATE (KT-FT) 55520 65600
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-240800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST THU JUL 23 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 0 10 10 20
TEMP (24H TREND) 74 (-2) 91 (0) 74 90
RH % (24H TREND) 90 (0) 56 (-7) 93 59
WIND 20FT/EARLY(MPH) E 18 E 18 E 18 E 18
WIND 20FT/LATE(MPH) E 18 E 24 G31 E 11 E 21
MIXING HGT(FT-AGL/MSL) 5130 5070
TRANSPORT WND (MPH) E 16 E 17
VENT RATE (KT-FT) 71820 76050
DISPERSION 5 5
DSI 5 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-240800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST THU JUL 23 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 50 10 10
TEMP (24H TREND) 78 (-1) 88 (+1) 78 86
RH % (24H TREND) 89 (+2) 66 (-3) 94 69
WIND 20FT/EARLY(MPH) E 16 E 18 E 18 E 18
WIND 20FT/LATE(MPH) E 16 E 17 E 18 E 18
MIXING HGT(FT-AGL/MSL) 3300 3220
TRANSPORT WND (MPH) E 21 E 23
VENT RATE (KT-FT) 59400 64400
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-240800-
ST CROIX-
330 PM AST THU JUL 23 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER PCLDY PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 50 10 10
TEMP (24H TREND) 78 (-1) 88 (-1) 77 87
RH % (24H TREND) 87 (+1) 66 (-1) 94 69
WIND 20FT/EARLY(MPH) E 16 E 19 E 17 E 18
WIND 20FT/LATE(MPH) E 14 E 17 E 17 E 18
MIXING HGT(FT-AGL/MSL) 4690 4620
TRANSPORT WND (MPH) E 22 E 25
VENT RATE (KT-FT) 89110 101640
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
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